| Time | Life time Khat chewers; n = 202 | |
| Number | Percent | |
| Grade 1 - 6 | 4 | 2 |
| Grade 7 - 8 | 6 | 3 |
| Grade 9 - 10 | 30 | 14.9 |
| Grade 11 - 12 | 60 | 29.7 |
| First year in the university | 76 | 37.5 |
| Second year in the university | 20 | 9.9 |
| Third year in the university | 4 | 2 |
| Fourth year in the university | 1 | 0.5 |
| Fifth year in the university | 0 | 0 |
| Other time | 1 | 0.5 |